Industrial Application of the Flushing Process to High Purification of Natural Raw Materials

冲洗工艺在天然原料高提纯中的工业应用

• 批准号: 08650789
• 负责人: HAYASHI Tsuyoshi
• 金额: $ 1.22万
• 依托单位: Teikyo University of Science & Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650789/
• 关键词: amorphous graphite; sericite; natural raw materials; oscillating liquid continuous extraction apparatus,; flushing process; beneficiation; particle separation by oil-extraction; 微細粒子分離法; 天然原料の精製法; 液-液連続抽出法

The flushing process was developed by the author for the purpose of highly efficient separation of fine impurity particles from ceramic raw materials. In this sophisticated process, ultrafine mineral particles of under 1mum size suspended in raw ore slurries are extracted with kerosene.In this report, a natural amorphous graphite and some sericite clays were treated experimentally using a commercial liquid-liquid continuous extraction apparatus to reveal the practical value of the flushing process in industrial application.The amorphous graphite which was already concentrated in China was selected for the further elimination of clayy impurities. The sericite clay occurring at Taiwan is sometimes required to lower the contents of As and Pb for the use in cosmetics. The low grade sericite occurring at Okayama contains abundant pyrite for which the separation of pyrite is necessary for its industrial application.These raw materials were classified at a certain size of micrometer order in … More prior to the flushing operation. The aqueous slurries were conditioned at pH 4.3 in the presence of citric acid, EDTA,sodium dithionite to enhance the hydrophobicity of desired substance for oil-extraction. Besides operational conditions were determined such as feed rate, numbers of oscillating motion of impeller, slurry density, hold-up fraction.The commercial extractor made by Shimasaki Manufacturing Co.showed excellent function for the oil-extraction of solid particles owing to its cylinder-shaped impeller by which high shearing stress fine oil droplets are created available for the collection of the hydrophobic solid particles, together with the release of the constituent particles to individual particles. The graphite particles extracted into the oil phase were returned to its original aqueous dispersions by the addition of nonionic surfactant and sodium carbonate and were recovered using centrifuge. The ash content of the 2mum sample was significantly lowered to 1.8mass% with the removed ratio of 88.5%. In addition, the waste oil was regenerated by washing with sulfuric acid.Separation of pyrite from the sericite clays was well performed. The content of As and Pb in Taiwan sericite could be lowered under the values of criterion for cosmetics. As to Okayama sericite, the efficiency of eliminating Pb was decreased when the raw ore had been oxidized.In conclusion, the experimental results suggest that the flushing process is very advantage for technical purification of natural raw materials. Less

为高效分离陶瓷原料中的细小杂质颗粒，作者开发了冲洗工艺。在这个复杂的过程中，悬浮在原矿浆中的1微米以下的超细矿物颗粒用煤油提取。在这份报告中，天然无定形石墨和一些绢云母粘土实验性地使用商业液体-为了揭示冲洗工艺在工业应用中的实用价值，选择了我国已富集的无定形石墨作为进一步研究的对象，除去粘土杂质。产于台湾的绢云母粘土，在化妆品中有时需要降低砷、铅的含量。产于冈山的低品位绢云母中含有丰富的黄铁矿，工业应用中必须分离黄铁矿。 ...更多信息 在冲洗操作之前。在柠檬酸、EDTA、连二亚硫酸钠的存在下，将水性浆液调节至pH 4.3，以增强用于油提取的所需物质的疏水性。此外，还确定了进料量、叶轮摆动次数、浆液密度、滞留分数等操作条件。岛崎制作所生产的商用萃取器由于其圆柱形叶轮，可产生高剪切应力的细油滴，可用于收集疏水性固体颗粒，因此对固体颗粒的萃取表现出良好的功能。同时将组成颗粒释放成单个颗粒。通过加入非离子表面活性剂和碳酸钠，将萃取到油相中的石墨颗粒返回到其原始的水分散体中，并使用离心进行回收。2 μ m样品的灰分含量显著降低至1.8mass%，去除率为88.5%。此外，废油经硫酸洗涤再生后，黄铁矿与绢云母粘土的分离效果良好。台湾绢云母中砷、铅含量可降低至化妆品标准值以下。对于冈山绢云母，原矿石经氧化处理后，除铅效率降低，实验结果表明，该工艺对于天然原料的工艺提纯是非常有利的。少